Atomic and electronic structure of five-fold i-Al-Pd-Mn surfaces

Differently prepared surfaces of quasicrystalline icosahedral Al-Pd-Mn cut perpendicularly to a five-fold symmetry axis are analysed using angle-resol ved photoemission in the X-ray and in the ultraviolet range of photon energ ies, in order to study the geometrical and electronic structure, respective ly. Depending on the preparation, we find both, surfaces with crystalline s tructure, metallic character and surfaces with quasicrystalline structural fingerprints and a suppressed density of states at the Fermi level compatib le with a pseudogap. (C) 2000 Elsevier Science B.V. All rights reserved.